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Ulrich Paquet
Wednesday 27 April 2005, 15:00-16:00
Variational Gibbs Sampling
- đ¤ Speaker: Ulrich Paquet
- đ Date & Time: Wednesday 27 April 2005, 15:00 - 16:00
- đ Venue: Ryle Seminar Room, Cavendish Laboratory
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Phil Cowans
Abstract
I introduce a MCMC method for sampling from latent variable models. The sampling scheme circumvents the traditional latent variable sample by creating a transition kernel with the required parameter posterior as its invariant distribution, hoping to smooth over local maxima and trapping states in the latent variable space. In general this kernel is not analytically tractable and I approximate it with a simpler distribution using an EM bound; I’ll also discuss methods to correct this approximate chain. Finally I’ll relate the method to two-stage Gibbs sampling, EM and variational methods.
Series This talk is part of the Inference Group series.
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